Julius foestee



. (Model.) 2 Sheets-Sheet 1.

J. FORSTBR.

' PERMUTATION 1.00K.

120,267,977. Patented Nov. 21, 1882.

III/l i UNITED STATES PATENT: OFFICE.

JULIUS FORSTER, OF DEGATUR, GEORGIA, ASSIGNOR OF ONE-HALF TO T. G.MGKENNEY, OF SAME PLAGE.-

PERMUTATiON-LOCK.

SPECIFICATION forming part of Letters Patent No. 267,977, dated November21, 1882 Application led July G, 1882. (Model.)

To all whom it may concern Be it known thatI, J ULIUs FORSTER, acitizenof the United States, residing at Decatur, in the county of De Kalb andState of Georgia, haveinvented certain new and useful Improvements inLocks, of which the following is a specification, reference being hadtherein to the accompanying drawings.

This invention relates to certain improvements in combination-locks, andit has for its objects to provide certain means whereby the lock-bolt,after being projected, may be fastened securely by combination devices,which may be shifted to effect such fasteningin such manner that thelock-bolt cannot be thrown back Without returning said devices to theirnormal positions.

1n the drawings, Figure l represents a View of my improved lock with thefront plate removed, showing the interior thereof and the working partsof the lock. Fig. lab is a partial longitudinal vertical section and anend view of the lock-bolt and the rib on which it slides. Fig. 2represents a transverse vertical sectional view on the line m a' of Fig.l. Fig. 3 repl resents a View of the face of thelock, showing the meansemployed for setting the bolt-fastening devices. v Fig. Arepresents adetached view of one of the tumblers. Fig. 5 represents a detached viewof one of the disks and its connection employed in connection with thefastening devices for securing the lock-holt when projected. Fig. 6 is atop view of the lock-bolt.

The letter A indicates the lock-casing, which is constructed in theusual manner, and B the lock-bolt, which at its forward end sets in anopening at the forward edge of the lock-casing,

`as usual, and at its rear end is slotted and sets over a longitudinalrib, C, on the back of the lock-Casin g. The lock-bolt, about midwaybetween its'ends, and in the neighborhood of the key-hole, has formed arecess, D, in its lower edge, with which the key engages in order tomove said bolt. Almost immediatelyr 4in line with said recess, on theupper edge, is

formed a recess, E, which is adapted to be engaged by a lug, F, on thebolt-spring G. This spring is of peculiar construction, beingelliptically curved,as shown in dotted lines, Fig. 1, the saidelliptical portion setting under the key as it is turned, so as to` liftthe lng F and permit the bolt to be moved, the lug F being formed on ahorizontal extension of the elliptical part of the spring, the 'saidextension being formed with an eye, H, setti ng over a stud, I, onthelock-casing,and then bent upward and bearing against a stud, K, asshown in Fig. l.

The letter L indicates two tumblers secured to the springsM, mounted onthe studs M', their free ends bearing against the studs N. The saidtumblers overset the bolt, as shown in Fig. l, and are provided withdetents P, adapted to engage the recesses R R and S `S on the lower edgeof the lock-bolt. The said tumblers on their faces are provided withsegmental cams T, against which bear the peripheries of the rotatingcams U, which are secured to the shafts V, journaled in bearings in thecasing, and projecting through the front thereof.

The shaft V of one of said cams is provided witha'n arm, W, which isbent at the extremity, and is adapted to engage the recess E on theupper edge of the lock-bolt. The said arm is held normally in place by aspring, Y.

The letter A indicates two disks mounted on the shafts B,journaled inthecasing and projecting in front as the cam-shafts before mentioned.The said disks are slotted at C on their peripheries, and their shaftsare screwthreaded and provided with bent arms D', setting between lugs Ein such manner that when the shafts are elevated or depressed the endsof the arms will be thrown into one of the recesses at each side of thecentral recess of the bolt, as shown in Fig. l, when the bolt is lockedto fasten the same, or out of said re! cess to unfasten the bolt andpermit it to be moved back. The slots on the peripheries of the disksare adapted to engage the lugs F on the tumblers, to hold the parts whenthe bolt is fastened.

The letter G indicates the knob-bolt of the lock, and H' its spring 5and the letter I indicates the latch-bolt, and K the knob and arm bymeans of which it can be operated.

Theshafts of the bolt-fastening devices before mentioned are providedwith cog-disks L and plain disks M2 at'their outer ends, the

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plain disks being provided on their rear faces with lugs N', which areadapted to engage the cog-disks at any convenient point. The cogdisksare squared on the said shafts, while the plain disks are arranged torotate thereon, so that their positions may be changed With respect toeach other. The faces of the plain disks -are marked With the letters ofthe alph abet, s'o that the position of the interior fastening devicesmay be known to the person setting them from the outside, and to noothers.

It will be evident from the above that when the bolt is projected, bybringing the cams and disks into proper position, the lock may befastened so that it cannot be turned by the key, and as the position ofthe cams and disks can be changed indenitely from the outside, and assuch position can be regulated by the devices on the outside ot' thelock, it will be perceived that it. will be almost'impossible for anypersonexcept the one setting the lock to open the same.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, 1s

l. In combination With the -bolt and tumblers, the disks slotted attheir peripheries and adapted to engage lugs upon the said tum` blers,and the threaded disk shafts and arms, the latter being adapted to takeinto the recesses at the lower edge of the bolt, substantially as'andfor the purposes specified.

2. The combination, in a lock, of the lockbolt recessed as described,the tumblers, the cams and fastening-disks and their connections, andthecogged disks and plain disks,

